Air treatment unit



FIG. 1 is a front perspective view of an air treatment unit;

FIG. 2 is a rear perspective view of the air treatment unit shown in FIG. 1;

FIG. 3 is a front elevational view of the air treatment unit of FIG. 1;

FIG. 4 is a right side elevational view of the air treatment unit of FIG. 1, a left side elevational view being identical to FIG. 4;

FIG. 5 is a rear side elevational view of the air treatment unit of FIG. 1;

FIG. 6 is a top plan view of the air treatment unit shown in FIG. 1; and,

FIG. 7 is a bottom plan view of the air treatment unit of FIG. 1.

The broken lines showing the bottom portion of the air treatment unit are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for an air treatment unit, as shown as described. 